Golang model.FindTask函數代碼示例

// dBTestsWildcard are the database verification tests for globbed file execution
func dBTestsWildcard() {
	task, err := model.FindTask("mocktaskid")
	So(err, ShouldBeNil)
	So(len(task.TestResults), ShouldEqual, TotalResultCount)

	Convey("along with the proper logs", func() {
		// junit_1.xml
		tl := dBFindOneTestLog("pkg1.test.test_things.test_params_func:2")
		So(tl.Lines[0], ShouldContainSubstring, "FAILURE")
		So(tl.Lines[6], ShouldContainSubstring, "AssertionError")
		tl = dBFindOneTestLog("pkg1.test.test_things.SomeTests.test_skippy")
		So(tl.Lines[0], ShouldContainSubstring, "SKIPPED")

		// junit_2.xml
		tl = dBFindOneTestLog("tests.ATest.fail")
		So(tl.Lines[0], ShouldContainSubstring, "FAILURE")
		So(tl.Lines[1], ShouldContainSubstring, "AssertionFailedError")

		// junit_3.xml
		tl = dBFindOneTestLog(
			"test.test_threads_replica_set_client.TestThreadsReplicaSet.test_safe_update",
		)
		So(tl.Lines[0], ShouldContainSubstring, "SKIPPED")
		tl = dBFindOneTestLog("test.test_bson.TestBSON.test_basic_encode")
		So(tl.Lines[0], ShouldContainSubstring, "AssertionError")
	})
}

func TestTaskExecTimeout(t *testing.T) {
	setupTlsConfigs(t)
	for tlsString, tlsConfig := range tlsConfigs {
		Convey("With agent running a slow test and live API server over "+tlsString, t, func() {
			testTask, _, err := setupAPITestData(testConfig, "exec_timeout_task", "linux-64", NoPatch, t)
			testutil.HandleTestingErr(err, t, "Failed to find test task")
			testServer, err := apiserver.CreateTestServer(testConfig, tlsConfig, plugin.APIPlugins, Verbose)
			testutil.HandleTestingErr(err, t, "Couldn't create apiserver: %v", err)
			testAgent, err := New(testServer.URL, testTask.Id, testTask.Secret, "", testConfig.Expansions["api_httpscert"])
			So(err, ShouldBeNil)
			So(testAgent, ShouldNotBeNil)

			Convey("after the slow test runs beyond the timeout threshold", func() {
				// actually run the task.
				// this function won't return until the whole thing is done.
				testAgent.RunTask()
				testAgent.APILogger.Flush()
				time.Sleep(5 * time.Second)
				printLogsForTask(testTask.Id)
				Convey("the test should be marked as failed and timed out", func() {
					So(scanLogsForTask(testTask.Id, "executing the pre-run script"), ShouldBeTrue)
					So(scanLogsForTask(testTask.Id, "executing the post-run script!"), ShouldBeTrue)
					So(scanLogsForTask(testTask.Id, "executing the task-timeout script!"), ShouldBeTrue)
					testTask, err = model.FindTask(testTask.Id)
					So(testTask.Status, ShouldEqual, evergreen.TaskFailed)
					So(testTask.Details.TimedOut, ShouldBeTrue)
					So(testTask.Details.Description, ShouldEqual, "shell.exec")
				})
			})
		})
	}
}

func (as *APIServer) checkTask(checkSecret bool, next http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		taskId := mux.Vars(r)["taskId"]
		if taskId == "" {
			as.LoggedError(w, r, http.StatusBadRequest, fmt.Errorf("missing task id"))
			return
		}
		task, err := model.FindTask(taskId)
		if err != nil {
			as.LoggedError(w, r, http.StatusInternalServerError, err)
			return
		}
		if task == nil {
			as.LoggedError(w, r, http.StatusNotFound, fmt.Errorf("task not found"))
			return
		}

		if checkSecret {
			secret := r.Header.Get(evergreen.TaskSecretHeader)

			// Check the secret - if it doesn't match, write error back to the client
			if secret != task.Secret {
				evergreen.Logger.Logf(slogger.ERROR, "Wrong secret sent for task %v: Expected %v but got %v", taskId, task.Secret, secret)
				http.Error(w, "wrong secret!", http.StatusConflict)
				return
			}
		}

		context.Set(r, apiTaskKey, task)
		// also set the task in the context visible to plugins
		plugin.SetTask(r, task)
		next(w, r)
	}
}

func TestPatchPluginAPI(t *testing.T) {
	testConfig := evergreen.TestConfig()
	Convey("With a running api server and installed plugin", t, func() {
		registry := plugin.NewSimpleRegistry()
		gitPlugin := &GitPlugin{}
		err := registry.Register(gitPlugin)
		testutil.HandleTestingErr(err, t, "Couldn't register patch plugin")
		server, err := apiserver.CreateTestServer(testConfig, nil, plugin.APIPlugins, false)
		testutil.HandleTestingErr(err, t, "Couldn't set up testing server")
		taskConfig, _ := plugintest.CreateTestConfig("testdata/plugin_patch.yml", t)
		testCommand := GitApplyPatchCommand{"dir"}
		_, _, err = plugintest.SetupAPITestData("testTask", true, t)
		testutil.HandleTestingErr(err, t, "Couldn't set up test documents")
		testTask, err := model.FindTask("testTaskId")
		testutil.HandleTestingErr(err, t, "Couldn't set up test patch task")

		sliceAppender := &evergreen.SliceAppender{[]*slogger.Log{}}
		logger := agent.NewTestLogger(sliceAppender)

		Convey("calls to existing tasks with patches should succeed", func() {
			httpCom := plugintest.TestAgentCommunicator(testTask.Id, testTask.Secret, server.URL)
			pluginCom := &agent.TaskJSONCommunicator{gitPlugin.Name(), httpCom}
			patch, err := testCommand.GetPatch(taskConfig, pluginCom, logger)
			So(err, ShouldBeNil)
			So(patch, ShouldNotBeNil)
			testutil.HandleTestingErr(db.Clear(version.Collection), t,
				"unable to clear versions collection")
		})
		Convey("calls to non-existing tasks should fail", func() {
			v := version.Version{Id: ""}
			testutil.HandleTestingErr(v.Insert(), t, "Couldn't insert dummy version")
			httpCom := plugintest.TestAgentCommunicator("BAD_TASK_ID", "", server.URL)
			pluginCom := &agent.TaskJSONCommunicator{gitPlugin.Name(), httpCom}
			patch, err := testCommand.GetPatch(taskConfig, pluginCom, logger)
			So(err.Error(), ShouldContainSubstring, "not found")
			So(err, ShouldNotBeNil)
			So(patch, ShouldBeNil)
			testutil.HandleTestingErr(db.Clear(version.Collection), t,
				"unable to clear versions collection")
		})
		Convey("calls to existing tasks without patches should fail", func() {
			noPatchTask := model.Task{Id: "noPatchTask", BuildId: "a"}
			testutil.HandleTestingErr(noPatchTask.Insert(), t, "Couldn't insert patch task")
			noPatchVersion := version.Version{Id: "noPatchVersion", BuildIds: []string{"a"}}
			testutil.HandleTestingErr(noPatchVersion.Insert(), t, "Couldn't insert patch version")
			v := version.Version{Id: ""}
			testutil.HandleTestingErr(v.Insert(), t, "Couldn't insert dummy version")
			httpCom := plugintest.TestAgentCommunicator(noPatchTask.Id, "", server.URL)
			pluginCom := &agent.TaskJSONCommunicator{gitPlugin.Name(), httpCom}
			patch, err := testCommand.GetPatch(taskConfig, pluginCom, logger)
			So(err, ShouldNotBeNil)
			So(err.Error(), ShouldContainSubstring, "no patch found for task")
			So(patch, ShouldBeNil)
			testutil.HandleTestingErr(db.Clear(version.Collection), t,
				"unable to clear versions collection")
		})

	})
}

func TestTaskEndEndpoint(t *testing.T) {
	setupTlsConfigs(t)
	for tlsString, tlsConfig := range tlsConfigs {
		testTask, _, err := setupAPITestData(testConfig, "random", "linux-64", NoPatch, t)
		testutil.HandleTestingErr(err, t, "Couldn't make test data: %v", err)

		Convey("With a live api server, agent, and test task over "+tlsString, t, func() {
			testServer, err := apiserver.CreateTestServer(testConfig, tlsConfig, plugin.APIPlugins, Verbose)
			testutil.HandleTestingErr(err, t, "Couldn't create apiserver: %v", err)
			testAgent, err := createAgent(testServer, testTask)
			testutil.HandleTestingErr(err, t, "failed to create agent: %v")
			testAgent.heartbeater.Interval = 10 * time.Second
			testAgent.StartBackgroundActions(&NoopSignalHandler{})

			Convey("calling end() should update task's/host's status properly "+
				"and start running the next task", func() {
				subsequentTaskId := testTask.Id + "Two"
				details := &apimodels.TaskEndDetail{Status: evergreen.TaskSucceeded}
				taskEndResp, err := testAgent.End(details)
				time.Sleep(1 * time.Second)
				So(err, ShouldBeNil)

				taskUpdate, err := model.FindTask(testTask.Id)
				So(err, ShouldBeNil)
				So(taskUpdate.Status, ShouldEqual, evergreen.TaskSucceeded)

				testHost, err := host.FindOne(host.ById(testTask.HostId))
				So(err, ShouldBeNil)
				So(testHost.RunningTask, ShouldEqual, subsequentTaskId)

				taskUpdate, err = model.FindTask(subsequentTaskId)
				So(err, ShouldBeNil)
				So(taskUpdate.Status, ShouldEqual, evergreen.TaskDispatched)

				So(taskEndResp, ShouldNotBeNil)
				So(taskEndResp.RunNext, ShouldBeTrue)
				So(taskEndResp.TaskId, ShouldEqual, subsequentTaskId)
			})
		})
	}
}

func TestPatchTask(t *testing.T) {
	setupTlsConfigs(t)
	testConfig := evergreen.TestConfig()
	db.SetGlobalSessionProvider(db.SessionFactoryFromConfig(testConfig))
	patchModes := []patchTestMode{InlinePatch, ExternalPatch}
	testutil.ConfigureIntegrationTest(t, testConfig, "TestPatchTask")
	for tlsString, tlsConfig := range tlsConfigs {
		for _, testSetup := range testSetups {
			Convey(testSetup.testSpec, t, func() {
				Convey("With agent running a patched 'compile'"+tlsString, func() {
					for _, mode := range patchModes {
						Convey(fmt.Sprintf("Using patch mode %v", mode.String()), func() {
							testTask, _, err := setupAPITestData(testConfig, "compile", "linux-64", mode, t)
							testutil.HandleTestingErr(err, t, "Error setting up test data: %v", err)
							testServer, err := apiserver.CreateTestServer(testConfig, tlsConfig, plugin.APIPlugins, Verbose)
							testutil.HandleTestingErr(err, t, "Couldn't create apiserver: %v", err)
							testAgent, err := New(testServer.URL, testTask.Id, testTask.Secret, "", testConfig.Expansions["api_httpscert"])

							// actually run the task.
							// this function won't return until the whole thing is done.
							testAgent.RunTask()
							time.Sleep(100 * time.Millisecond)
							testAgent.APILogger.FlushAndWait()
							printLogsForTask(testTask.Id)

							Convey("all scripts in task should have been run successfully", func() {
								So(scanLogsForTask(testTask.Id, "executing the pre-run script"), ShouldBeTrue)
								So(scanLogsForTask(testTask.Id, "executing the post-run script!"), ShouldBeTrue)

								So(scanLogsForTask(testTask.Id, "Cloning into") || // git 1.8
									scanLogsForTask(testTask.Id, "Initialized empty Git repository"), // git 1.7
									ShouldBeTrue)

								So(scanLogsForTask(testTask.Id, "i am patched!"), ShouldBeTrue)
								So(scanLogsForTask(testTask.Id, "i am a patched module"), ShouldBeTrue)

								So(scanLogsForTask(testTask.Id, "i am compiling!"), ShouldBeTrue)
								So(scanLogsForTask(testTask.Id, "i am sanity testing!"), ShouldBeTrue)

								testTask, err = model.FindTask(testTask.Id)
								testutil.HandleTestingErr(err, t, "Error finding test task: %v", err)
								So(testTask.Status, ShouldEqual, evergreen.TaskSucceeded)
							})
						})
					}
				})
			})
		}
	}

}

func TestAttachResults(t *testing.T) {
	resetTasks(t)
	testConfig := evergreen.TestConfig()
	Convey("With attachResults plugin installed into plugin registry", t, func() {
		registry := plugin.NewSimpleRegistry()
		attachPlugin := &AttachPlugin{}
		err := registry.Register(attachPlugin)
		testutil.HandleTestingErr(err, t, "Couldn't register plugin: %v")

		server, err := apiserver.CreateTestServer(testConfig, nil, plugin.APIPlugins, true)
		testutil.HandleTestingErr(err, t, "Couldn't set up testing server")
		httpCom := plugintest.TestAgentCommunicator("mocktaskid", "mocktasksecret", server.URL)
		configFile := "testdata/plugin_attach_results.yml"
		resultsLoc := "testdata/plugin_attach_results.json"
		taskConfig, err := plugintest.CreateTestConfig(configFile, t)
		testutil.HandleTestingErr(err, t, "failed to create test config: %v")
		taskConfig.WorkDir = "."
		sliceAppender := &evergreen.SliceAppender{[]*slogger.Log{}}
		logger := agent.NewTestLogger(sliceAppender)

		Convey("all commands in test project should execute successfully", func() {
			for _, task := range taskConfig.Project.Tasks {
				So(len(task.Commands), ShouldNotEqual, 0)
				for _, command := range task.Commands {
					pluginCmds, err := registry.GetCommands(command, taskConfig.Project.Functions)
					testutil.HandleTestingErr(err, t, "Couldn't get plugin command: %v")
					So(pluginCmds, ShouldNotBeNil)
					So(err, ShouldBeNil)
					pluginCom := &agent.TaskJSONCommunicator{pluginCmds[0].Plugin(), httpCom}
					err = pluginCmds[0].Execute(logger, pluginCom, taskConfig, make(chan bool))
					So(err, ShouldBeNil)
					task, err := model.FindTask(httpCom.TaskId)
					testutil.HandleTestingErr(err, t, "Couldn't find task")
					So(task, ShouldNotBeNil)
					// ensure test results are exactly as expected
					// attempt to open the file
					reportFile, err := os.Open(resultsLoc)
					testutil.HandleTestingErr(err, t, "Couldn't open report file: '%v'", err)
					results := &model.TestResults{}
					err = util.ReadJSONInto(reportFile, results)
					testutil.HandleTestingErr(err, t, "Couldn't read report file: '%v'", err)
					testResults := *results
					So(task.TestResults, ShouldResemble, testResults.Results)
					testutil.HandleTestingErr(err, t, "Couldn't clean up test temp dir")
				}
			}
		})
	})
}

// DispatchTaskForHost assigns the task at the head of the task queue to the
// given host, dequeues the task and then marks it as dispatched for the host
func DispatchTaskForHost(taskQueue *model.TaskQueue, assignedHost *host.Host) (
	nextTask *model.Task, err error) {
	if assignedHost == nil {
		return nil, fmt.Errorf("can not assign task to a nil host")
	}

	// only proceed if there are pending tasks left
	for !taskQueue.IsEmpty() {
		queueItem := taskQueue.NextTask()
		// pin the task to the given host and fetch the full task document from
		// the database
		nextTask, err = model.FindTask(queueItem.Id)
		if err != nil {
			return nil, fmt.Errorf("error finding task with id %v: %v",
				queueItem.Id, err)
		}
		if nextTask == nil {
			return nil, fmt.Errorf("refusing to move forward because queued "+
				"task with id %v does not exist", queueItem.Id)
		}

		// dequeue the task from the queue
		if err = taskQueue.DequeueTask(nextTask.Id); err != nil {
			return nil, fmt.Errorf("error pulling task with id %v from "+
				"queue for distro %v: %v", nextTask.Id,
				nextTask.DistroId, err)
		}

		// validate that the task can be run, if not fetch the next one in
		// the queue
		if shouldSkipTask(nextTask) {
			evergreen.Logger.Logf(slogger.WARN, "Skipping task %v, which was "+
				"picked up to be run but is not runnable - "+
				"status (%v) activated (%v)", nextTask.Id, nextTask.Status,
				nextTask.Activated)
			continue
		}

		// record that the task was dispatched on the host
		err = nextTask.MarkAsDispatched(assignedHost, time.Now())
		if err != nil {
			return nil, fmt.Errorf("error marking task %v as dispatched "+
				"on host %v: %v", nextTask.Id, assignedHost.Id, err)
		}

		return nextTask, nil
	}
	return nil, nil
}

// dBTests are the database verification tests for standard one file execution
func dBTests() {
	task, err := model.FindTask("mocktaskid")
	So(err, ShouldBeNil)
	So(len(task.TestResults), ShouldNotEqual, 0)

	Convey("along with the proper logs", func() {
		// junit_3.xml
		tl := dBFindOneTestLog(
			"test.test_threads_replica_set_client.TestThreadsReplicaSet.test_safe_update",
		)
		So(tl.Lines[0], ShouldContainSubstring, "SKIPPED")
		tl = dBFindOneTestLog("test.test_bson.TestBSON.test_basic_encode")
		So(tl.Lines[0], ShouldContainSubstring, "AssertionError")
	})
}

func TestTaskFailures(t *testing.T) {
	setupTlsConfigs(t)

	testutil.ConfigureIntegrationTest(t, testConfig, "TestTaskFailures")

	for tlsString, tlsConfig := range tlsConfigs {
		for _, testSetup := range testSetups {
			Convey(testSetup.testSpec, t, func() {
				Convey("With agent running a failing test and live API server over "+tlsString, func() {
					testTask, _, err := setupAPITestData(testConfig, "failing_task",
						"linux-64", NoPatch, t)
					testutil.HandleTestingErr(err, t, "Couldn't create test data: %v", err)
					testServer, err := apiserver.CreateTestServer(testConfig, tlsConfig, plugin.APIPlugins, Verbose)
					testutil.HandleTestingErr(err, t, "Couldn't create apiserver: %v", err)
					testAgent, err := createAgent(testServer, testTask)
					testutil.HandleTestingErr(err, t, "failed to create agent: %v")

					// actually run the task.
					// this function won't return until the whole thing is done.
					testAgent.RunTask()
					time.Sleep(100 * time.Millisecond)
					testAgent.APILogger.FlushAndWait()
					printLogsForTask(testTask.Id)

					Convey("the pre and post-run scripts should have run", func() {
						So(scanLogsForTask(testTask.Id, "executing the pre-run script"), ShouldBeTrue)
						So(scanLogsForTask(testTask.Id, "executing the post-run script!"), ShouldBeTrue)

						Convey("the task should have run up until its first failure", func() {
							So(scanLogsForTask(testTask.Id, "starting failing_task!"), ShouldBeTrue)
							So(scanLogsForTask(testTask.Id, "done with failing_task!"), ShouldBeFalse)
						})

						Convey("the tasks's final status should be FAILED", func() {
							testTask, err = model.FindTask(testTask.Id)
							testutil.HandleTestingErr(err, t, "Failed to find test task")
							So(testTask.Status, ShouldEqual, evergreen.TaskFailed)
							So(testTask.Details.Status, ShouldEqual, evergreen.TaskFailed)
							So(testTask.Details.Description, ShouldEqual, "failing shell command")
							So(testTask.Details.TimedOut, ShouldBeFalse)
							So(testTask.Details.Type, ShouldEqual, model.SystemCommandType)
						})
					})
				})
			})
		}
	}
}

func TestTaskAbortion(t *testing.T) {
	setupTlsConfigs(t)

	testutil.ConfigureIntegrationTest(t, testConfig, "TestTaskAbortion")
	for tlsString, tlsConfig := range tlsConfigs {
		for _, testSetup := range testSetups {
			Convey(testSetup.testSpec, t, func() {
				Convey("With agent running a slow test and live API server over "+tlsString, func() {
					testTask, _, err := setupAPITestData(testConfig, "very_slow_task", "linux-64", NoPatch, t)
					testutil.HandleTestingErr(err, t, "Failed to find test task")
					testServer, err := apiserver.CreateTestServer(testConfig, tlsConfig, plugin.APIPlugins, Verbose)
					testutil.HandleTestingErr(err, t, "Couldn't create apiserver: %v", err)
					testAgent, err := createAgent(testServer, testTask)
					testutil.HandleTestingErr(err, t, "failed to create agent: %v")

					Convey("when the abort signal is triggered on the task", func() {
						go func() {
							// Wait for a few seconds, then switch the task to aborted!
							time.Sleep(3 * time.Second)
							err := testTask.Abort("", true)
							testutil.HandleTestingErr(err, t, "Failed to abort test task")
							fmt.Println("aborted task.")
						}()

						// actually run the task.
						// this function won't return until the whole thing is done.
						_, err := testAgent.RunTask()
						So(err, ShouldBeNil)

						testAgent.APILogger.Flush()
						time.Sleep(1 * time.Second)
						printLogsForTask(testTask.Id)

						Convey("the pre and post-run scripts should have run", func() {
							So(scanLogsForTask(testTask.Id, "executing the pre-run script"), ShouldBeTrue)
							So(scanLogsForTask(testTask.Id, "executing the post-run script!"), ShouldBeTrue)
							So(scanLogsForTask(testTask.Id, "Received abort signal - stopping."), ShouldBeTrue)
							So(scanLogsForTask(testTask.Id, "done with very_slow_task!"), ShouldBeFalse)
							testTask, err = model.FindTask(testTask.Id)
							testutil.HandleTestingErr(err, t, "Failed to find test task")
							So(testTask.Status, ShouldEqual, evergreen.TaskUndispatched)
						})
					})
				})
			})
		}
	}
}

// Returns a JSON response with the status of the specified task.
// The keys of the object are the test names.
func (restapi restAPI) getTaskStatus(w http.ResponseWriter, r *http.Request) {
	taskId := mux.Vars(r)["task_id"]

	task, err := model.FindTask(taskId)
	if err != nil || task == nil {
		msg := fmt.Sprintf("Error finding task '%v'", taskId)
		statusCode := http.StatusNotFound

		if err != nil {
			evergreen.Logger.Logf(slogger.ERROR, "%v: %v", msg, err)
			statusCode = http.StatusInternalServerError
		}

		restapi.WriteJSON(w, statusCode, responseError{Message: msg})
		return

	}

	result := taskStatusContent{
		Id:     taskId,
		Name:   task.DisplayName,
		Status: task.Status,
	}

	// Copy over the status details
	result.StatusDetails.TimedOut = task.StatusDetails.TimedOut
	result.StatusDetails.TimeoutStage = task.StatusDetails.TimeoutStage

	// Copy over the test results
	result.Tests = make(taskStatusByTest, len(task.TestResults))
	for _, _testResult := range task.TestResults {
		numSecs := _testResult.EndTime - _testResult.StartTime
		testResult := taskTestResult{
			Status:    _testResult.Status,
			TimeTaken: time.Duration(numSecs * float64(time.Second)),
			Logs:      taskTestLogURL{_testResult.URL},
		}
		result.Tests[_testResult.TestFile] = testResult
	}

	restapi.WriteJSON(w, http.StatusOK, result)
	return

}

func (uis *UIServer) hostPage(w http.ResponseWriter, r *http.Request) {
	projCtx := MustHaveProjectContext(r)

	vars := mux.Vars(r)
	id := vars["host_id"]

	h, err := host.FindOne(host.ById(id))
	if err != nil {
		uis.LoggedError(w, r, http.StatusInternalServerError, err)
		return
	}

	if h == nil {
		http.Error(w, "Host not found", http.StatusNotFound)
		return
	}

	events, err := event.Find(event.MostRecentHostEvents(id, 50))
	if err != nil {
		uis.LoggedError(w, r, http.StatusInternalServerError, err)
		return
	}
	runningTask := &model.Task{}
	if h.RunningTask != "" {
		runningTask, err = model.FindTask(h.RunningTask)
		if err != nil {
			uis.LoggedError(w, r, http.StatusInternalServerError, err)
			return
		}
	}

	flashes := PopFlashes(uis.CookieStore, r, w)
	uis.WriteHTML(w, http.StatusOK, struct {
		Flashes     []interface{}
		Events      []event.Event
		Host        *host.Host
		RunningTask *model.Task
		User        *user.DBUser
		ProjectData projectContext
	}{flashes, events, h, runningTask, GetUser(r), projCtx},
		"base", "host.html", "base_angular.html", "menu.html")
}

// populateTaskBuildVersion takes a task, build, and version ID and populates a projectContext
// with as many of the task, build, and version documents as possible.
// If any of the provided IDs is blank, they will be inferred from the more selective ones.
// Returns the project ID of the data found, which may be blank if the IDs are empty.
func (pc *projectContext) populateTaskBuildVersion(taskId, buildId, versionId string) (string, error) {
	projectId := ""
	var err error
	// Fetch task if there's a task ID present; if we find one, populate build/version IDs from it
	if len(taskId) > 0 {
		pc.Task, err = model.FindTask(taskId)
		if err != nil {
			return "", err
		}

		if pc.Task != nil {
			// override build and version ID with the ones this task belongs to
			buildId = pc.Task.BuildId
			versionId = pc.Task.Version
			projectId = pc.Task.Project
		}
	}

	// Fetch build if there's a build ID present; if we find one, populate version ID from it
	if len(buildId) > 0 {
		pc.Build, err = build.FindOne(build.ById(buildId))
		if err != nil {
			return "", err
		}
		if pc.Build != nil {
			versionId = pc.Build.Version
			projectId = pc.Build.Project
		}
	}
	if len(versionId) > 0 {
		pc.Version, err = version.FindOne(version.ById(versionId))
		if err != nil {
			return "", err
		}
		if pc.Version != nil {
			projectId = pc.Version.Identifier
		}
	}
	return projectId, nil

}

func getHostsData(includeSpawnedHosts bool) (*hostsData, error) {
	data := &hostsData{}

	// get all of the hosts
	var dbHosts []host.Host
	var err error
	if includeSpawnedHosts {
		dbHosts, err = host.Find(host.IsRunning)
	} else {
		dbHosts, err = host.Find(host.ByUserWithRunningStatus(evergreen.User))
	}

	if err != nil {
		return nil, err
	}

	// convert the hosts to the ui models
	uiHosts := make([]uiHost, len(dbHosts))
	for idx, dbHost := range dbHosts {
		// we only need the distro id for the hosts page
		dbHost.Distro = distro.Distro{Id: dbHost.Distro.Id}
		host := uiHost{
			Host:        dbHost,
			RunningTask: nil,
		}

		uiHosts[idx] = host
		// get the task running on this host
		task, err := model.FindTask(dbHost.RunningTask)
		if err != nil {
			return nil, err
		}
		if task != nil {
			uiHosts[idx].RunningTask = task
		}
	}
	data.Hosts = uiHosts
	return data, nil
}